Hi everybody,
I have solved the above problem as follows :
I edited the file : <android-workspace>/system/core/init/devices.c
and, added the line : { "/dev/ttyUSB0", 0666, AID_ROOT, AID_ROOT,
0 },
to the data structure : static struct perms_ devperms[].
Now, whenever /dev/ttyUSB0 is created, it has the permissions :
crw-rw-rw- root root
Any comments, whether this is a good solution ?
And, does anyone know whether it is possible to do it with "udev
scripts" ?
Thanks,
Puneet Jindal
On Jul 4, 2:49 pm, Puneet <puneetjindal.1...@gmail.com> wrote:
> Hi everybody,
>
> I am trying to run Android on my prototype phone. The phone has a
> sensor (a device that reports its orientation to the phone) attached
> to it through the USB interface.
>
> I have developed a hardware module for that sensor, the name of the
> shared library for the module being "sensors.default.so". The module
> communicates with the sensor through the device file /dev/ttyUSB0.
>
> The problem I am facing is that the device file /dev/ttyUSB0 has
> permissions as:
> crw------- root root 188, 0
> 1980-01-10 18:47 ttyUSB0
>
> So, when I test the module's functionality by running a test android
> application, the application doesn't have enough privileges to read/
> write from/to the device file. So, the results are negative.
>
> And, if I test the same functionality by running a native test
> application (via the adb shell, so it runs as root), the results are
> positive.
>
> I tried to solve this issue by modifying the startup scripts (these
> run as root) to change the device file permissions at startup, but it
> seems that the device file is created after the scripts have completed
> their execution.
>
> Any suggestions on what should be done, to make the android
> application able to read/write from/to the device file ?
> How to change the device file permissions at the time of creation ?
>
> Thanks,
> Puneet Jindal
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